<html>
<head>
<link rel='stylesheet' href='../../../js/sh/SyntaxHighlighter.css' type='text/css' />
<script src='../../../js/sh/shCore.js'></script>
<script src='../../../js/sh/shBrushJava.js'></script>
<style>
* {
font-family:Courier New,monospace;
  padding: 0;
  margin: 0;
  white-space: nowrap;
  font-size: 11px;
}
.dp-highlighter {
  white-space: nowrap;
  overflow: visible;
  width: 600px;
  font-size: 11px;
  font-family:Courier New,monospace;
}
</style>
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<body>
<textarea name='code' class='java:nogutter' rows='15' cols='120'>
/*
 * SmartGWT (GWT for SmartClient)
 * Copyright 2008 and beyond, Isomorphic Software, Inc.
 *
 * SmartGWT is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License version 3
 * as published by the Free Software Foundation.  SmartGWT is also
 * available under typical commercial license terms - see
 * http://smartclient.com/license
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 */

import com.smartgwt.client.types.Cursor;
import com.smartgwt.client.types.DragAppearance;
import com.smartgwt.client.types.ImageStyle;
import com.smartgwt.client.types.Overflow;
import com.smartgwt.client.util.EventHandler;
import com.smartgwt.client.widgets.Canvas;
import com.smartgwt.client.widgets.Img;
import com.smartgwt.client.widgets.events.DragMoveEvent;
import com.smartgwt.client.widgets.events.DragMoveHandler;
import com.smartgwt.client.widgets.events.DragStartEvent;
import com.smartgwt.client.widgets.events.DragStartHandler;

public class DragPanSample implements EntryPoint {

    public void onModuleLoad() {
        Canvas canvas = new Canvas();
        canvas.addChild(new DragPanSampleImg());
        canvas.draw();
    }

    public static class DragPanSampleImg extends Img {
        private int startScrollLeft;
        private int startScrollTop;
        public DragPanSampleImg() {
            super("other/cpu.jpg", 200, 200);
            
            setLeft(50);
            setTop(50);
            setOverflow(Overflow.HIDDEN);
            setShowEdges(true);
            setPadding(20);
            setImageType(ImageStyle.NORMAL);
            setCanDrag(true);
            setCursor(Cursor.ALL_SCROLL);
            setDragAppearance(DragAppearance.NONE); 
            addDragStartHandler(new DragStartHandler() {
                public void onDragStart(DragStartEvent event) {
                    startScrollLeft = getScrollLeft();
                    startScrollTop = getScrollTop();
                }
            });          
            addDragMoveHandler(new DragMoveHandler() {
                public void onDragMove(DragMoveEvent event) {
                    int left = startScrollLeft - EventHandler.getX() + EventHandler.getMouseDownX();
                    int top = startScrollTop - EventHandler.getY() + EventHandler.getMouseDownY();
                    scrollTo(left,top);
                }
            });
        }
    }

}
</textarea>
<script class='javascript'>
dp.SyntaxHighlighter.HighlightAll("code");
</script>
</body>
</html>
